Buffers

Question 1

What is a buffer solution?

Answer 1

• Resists small changes in pH when small amounts of acid and alkali are added
• So keeps pH relatively constant
• Can consist of a weak acid - conjugate base or a weak base - conjugate acid

Question 2

Buffer Solution Calculations

Answer 2

Question 3

Applications of buffers

Answer 3

• In the body HCO3 - acts as a buffer for our blood
• Too higher [H+] could cause acidosis

CO2 (g) + H2O (l) ⇌ H+ (aq) + HCO3- (aq)

If increase in [H+], EQBM shifts left to restore EQBM, reduces conc of H+, keeps pH of blood constant.

If decrease, EQBM shifts right til restored, increases H+ conc and keeps pH of blood constant